Pre test ps

1. Which of the following statements is FALSE?

• a. The core of red giant star is made up of carbon

• b. The average star has shorter life span

• c. The more massive the star is the faster it burns its fuel

• d. No elements heavier than Iron can be produced in a massive star

2. Which is the second most abundant element in the universe?

•  a. carbon

• b. hydrogen

• c. helium

• d. oxygen

3. How is the energy of star produced? 

• How is the energy of star produced? 

• by nuclear fission    

• by decomposition    

• by nuclear fusion

Which phase of star will be created after the end of red giant?

• black hole    

•  supernova     

• red super giant    

• white dwarf

 Which is known as the biggest stars in the universe?

• main sequence star       

• red giant

• red super giant

• white dwarf

Which phase of star will be created after the end of red giant?

• black hole

• red super giant

• supernova

• white dwarf

In this process there’s a buildup of a VERY heavy isotope, then as beta-decays occur, you march up in atomic number and produce heavy product

• S Process        

• . R-Process        

• Proton-Proton Reaction

• Nuclear Fission

The following molecules have polar covalent bonds EXCEPT?   

• NH₃

• CS₂

• BCl₃

• HBr

Which of the following molecules is tetrahedral?   

• H₂O

• SF₆

• CH₄

• BF₃ 

In main sequence star, Hydrogen fuses and converted to Helium. What element is produced from Helium gas at its core?

• . carbon        

• . iron        

• neon

• silicon